US1624734A - Method of tamping and tamping machine - Google Patents

Description

,- April 12,1927. 1,624,734

c. R. HUNT METHOD OF TAMPING AND TAMPING MACHINE I File'd Aug. 2, I926 '2 Sheets-Sheet 1 I N VEN TOR 64/1 07 flaw- A TTORNEY ril 12 1927.- v AP c. R. HUNT METHOD OF TAMPING AND TAMPING MACHIN E Filed Aug. 2, 1926 a Sheec-Sheecfi 1N VEN TOR 64/1 6/2 /1? 70/77.

ATTORNEY Patented Apr. 12,

CALVERT R. HUNT, or Ramses CITY, MISSOURI.

METHOD OF TAMIING AND TAMPING MACHINE.

Application filed Angus-t 2, 1926. Serial No. 126,442.

My invention relates to a method of building a .road, and the apparatus for accom- 'pl ishing such method, and more particularly to a new and improved method of tmping a road and the tamping machine, the present application being a continuation in part of my application filed March 13, 1922, Serial No. 543,281.

It is a purpose of my invention to provide new and improved means for tamping a roadway, comprising a plurality of members having projections thereon adapted to be rolled over thesurface of the roadway to .tamp' and knead a binder into the same,

said projections being arranged in a plurality of circular series and the projections being staggered transversely of the rotatable means.

. her having a series of projections thereon It is a furtherpurpose of my invention to provide anew and improved road tamping and kneading device comprising rotatable means mounted at one end of a framework, a power unit mounted on the framework, and new and improved means for connecting the front axle with the power unit and with the framework to provide a substantially three point support for the power unit.

,It is a further purpose of my invention a to provide a new and improved method of tamping and kneading a surface such as a roadway, comprising the rolling of a mem over said surface and then-rolling a member having a series of projections of a different shape over the same surface. The ob ject of doing this is to avoid the sinking of the projections of one rotatable member in the recessesmade in the roadway by the projec'tions of a preceding rotatable member as would be the case if the projections were all of the-same shape. This may be accomplished by providing projections of different shapes on the same machine or providing projections of one shape on one machine and of a different shape on another machine so that when said machines follow each other, the projections on the following machine .will not enter the recesses made bythe projections on the preceding machine. In the fcase where different sized and shaped projections are provided on the same machine,"

the machines are staggered so-th at they do not exactly. follow in the same track, thus placing the similar projections on the variousmachines out of alignment.

It is a further purpose of the invention to provide a machine of the above mentioned character that can be moved back and forth over the surface to be operated on without turning the machine around.

Other objects and advantages of the invention will appear as the description of the accompanying drawings proceeds. However, I desire to have it distinctly understood that I do not intend to limit myself to the exact details shown or described, but that I intend to include as part of my invention all such obvious changes and modifications of'parts as would occur to a person skilled in this art and as would fall within the scope of the claims.

Fig. 4 is a transverse vertical sectionalview through the ground engaging tamping element, and I j I Fig. 5 is a perspective view-of the front axle engaging yoke member.

Referring'in detail to the drawings: My improved road tamping device comprises a power unit 10 of a well known type and a frame member having the longitudinally extending members 11 provided with the substantially parallel end portions 12 and 13 andthe obliquely extending portions 14 connecting the portions 12 and 13, thus providing a frame work thatis relatively wide at one end thereof and relativelynarrow at the other end thereof. The longitudinally extending members 11 are connected at their rear. ends by. means of the cross member 15 and at the front ends thereof by means of a yoke-like member formed by .a pair of transversely extending bars 17 having. flattened ends 18 which are secured to the parallel portions 12 'of the members 11.

The transversely extending members 17 are depressed in the center thereof, inclining downwardly from the opposite sides toward the center and are provided with aligning openings 19. .The aligning openings 19 furthermore align withthe opening 20 in the ear 21 depending from the power unit 10 and with an opening 22 in the front axle Q3. A- pivot pin 24: in the form of a bolt- -like member extends through the openings 19., 20 and 22, pivotally securing the power unit 10, the front axle 23 and the forward end of the frame together.

clamping the rear axle housing 31 of the power unit 10 to the framework. The power unit is provided with the usual steering wheel 32 which steers the front wheels 33 mounted on, the axle 23 in the usual manner and is furthermore provided with the usual drivers seat 34. A

The power unit. 10

drives suitab.e axles in the axle housing v31 in the usual manner,

have substantially: flat end portions, the prosprocket" wheels 35 being provided on the outer ends of said ,axles over which the sprocket chains 36 operate, said sprocket chains 36, passing over vthe sprockets 37 keyed to the shaft 38. Said shaft 38 is jourhalled in;bearing blocks 39 which are adjustably mounted on the parallel portions 13 of the longitudinally extending members 11 ofthe framework.- The bearing members 39 are adjustable by means of the set screws '41 extending through the vertically extending portions 41 of the U-shaped brackets 42 which are mounted upon the members 11 in any. suitable manner as by means of the bolts 43 which pass through the ears 44 on the members 42 and through openings in the strap or p? ate member 45 engaging the lower,

flange of the channelled frame member 11. The block 39 is substantially rectangular and 5 is slidable within the U-shaped member 42 lengthwise thereof through a limited dis-- tance, and accordingly can be adjusted within certain limits by means of the set screws 40, this adjustment being provided to take up'slack in the sprocket chain 36. If there is more slack in the chain than can be taken 'care of in this manner, a link is removed therefrom in the usual manner.

Mounted on the shaft 38 so as to rotate therewith preferably by means of the elongated key member 46, are the rotatable tamping elements 47. Each of said elements is provided with a series of ground engaging projections or teeth which are in theform of truncated pyramids and. which jections on one member 47 being sta gered relative to the projections on the a jacent member '47. The projections on one set of said members-which align transversely are 1 4 The frame isfurther provided with the intermediate projections 48 and jections on another set of said members which align with each other but not' with the projections of the previously mentioned set are indicated by the numeral 49. Thus the 49 are staggered relative to each other. Furthermore in order to prevent the meshing of the projections with the recesses made by preceding tamping members when 'a succeeding tamping member goes over the same ground, the tamping members are preferably made of two different shapes. Thus, for example, the tamping members at the right of Fig. 4 which are indicated by the numerals '48 and 49' respectively are wider and shorter circumferentially of the members 47 than the proj ections 48 and 49. Each of the members 47 is, of course, provided with the usual spokes 50 and a hub portion 51 through which the keymember 46 passes, and one member 47 on each end of the shaft is mounted between the end of the shaft and one of the sprockets 37 thus obtaining a greater width l for the tamping means. It is, of course, .un-

derstood that the key openings or ways in the members 47 are suitably arranged so as to stagger the projections andmaintain the same in proper staggered relation at all times. 1

Y Extending between the transversely extendingmember 26 and the rear'cros's member15 are the bars 52 having angular end portions 53 secured to the members 26 and 15, said members '52 extending between-the members. 47 and acting to scrape -ofi. or remove the earth from the teeth or projec tions on said member 47. A mud guard member 54 is also preferably provided whichextends from the member 26 through f substantially a quadrant and is secured at its upper end to the framework .by means of the diagonally extending braces 55.

In operation, a plurality of the tampingdevices is utilized, these following eac'h'other along the roadway to accomplish thetamping action. The first of said membersj'will,

of course, make recesses in the earth that is being tamped and in order to avoid the entering of said recesses by the projections on the succeeding tamping member, the succeeding tamping member s operated so that the projections 48f and 49', thereon will align with the recesses made in the surface of t 49, and as the projections 48' and 49 are of a different share than the projections 48 and 49, these will not merely sink into the recesses but will furthermore carry out the tamping action begun by the projections on" the preceding members. Thenext, following tamping machine will be operated -so Y that the project-ions 48 and 49'thereon will align with the recesses made by the projec tions 48' 49' of the second member and roadway by meansof the'projections 48 and so on, so that no corresponding projections will be following each other in rolling the members over the roadway.

Obviously it is immaterial in carrying out.

, .5 this method whether or not all the projecitions on a rotatable member are of the same size or of different sizes or just how the projections of the different, sizes are arranged \on the rotatable members, as long as the 10 projections of one circular series on one member 47 will be followedin ro 'ng over thesurfade by a member 47 that has projections of a different shape thereon, so that 'the projections will not merely mesh with the recesses in the roadway but will perform their tamping function in a similar manner to which the first rolling member with the projections thereon performed its tampingfunction.

What I claim and desire to secure by Letters Patent is:

1. In a device of the character described, a framework, a rotatable shaft mounted on the framework, and tamping and kneading means mounted on said shaft to rotate there ,with, and. comprising setsof members,.,the members of one set having contactsurfaces differing from those of the other set for the purpose set forth. 2. In a device of the character described, a framework, a shaft mounted for rotation A thereon, and rotatable tamping. and lmead ing means mounted on said'shaft to rotate therewith, saidtamping and kneading means comprising a plurality of circular-series of projecting members, said projectin members of adjacent series being-arrange in staggered relation and the end facesof said projectin members of certain of said series being 0 different shape than the end faces of projecting members of other of said series. J

' 3. In a device of the character described,

a framework, a shaft mounted for rotation thereon, and rotatable tamping and kneading means mounted on said shaft to rotate therewith, said tamping; and kneading means comprising a plurality of projecting members of different shapes arranged in staggered relation.

I 4. The method of tamping and kneading having roller associated with "the frame,

a surface comprising the rolling of a member having a series of projections thereon oversaid surface,'and then rolling said surface with a memberhaving a series of different projections. I

5. The method of tamping and kneading a surface comprising the rolling of a mem-. her having a series of projections thereon over said surface and then rolling a-membe'r a series of projections of a different shape over the same surface.

6. The method of tamping and kneading v I a surface. comprising thealternate rolling of members having projections of: different shapes thereon over said surface. I

7. A tamping machine, comprising a frame, a ground engaging: steering wheelv associated with the frame, and a tamping havinga plurality'of teeth arranged in overlapping, alternating rows, the teeth being in the form of truncated pyramids so that they will be equally effect ve when the machine is operating in either direction, and cleaning members mounted between the rows of teeth. 1

8. A tamping machine, comprising a frame, a. ground engaging steering wheel associated with the frame, a rotatable shaft' j in the frame, tamping wheels fixed tojthew shaft, each wheel having ground engaging teeth, each tooth being in the form of a truncated yramid, the teeth on one wheel being in 'lme with the space between the teeth of an adjacent wheel, and means lo.- cated between the wheels for removing mud from the teeth on the wheels.

9. A tamping -I nachine,- comprising a' frame, a smooth, ground engaging steering wheel associated with the frame, a rotatable shaft in the frame, tamping wheels fixed on the shaft havin abutting hub portions, pro-. vided with tee h in the form of truncated pyramids, the teeth on one wheel being always-maintained in line with the space be- 9 tween the teeth on an adjacent wheel, and bracing and cleaning bars, extending transversely betweensaid wheels below the hub portions thereof, said hub portions spacing said wheels. I

In testimony whereof ;I aflix my signature. CALVERT R. HUNT.

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